Just get mosa and kill everything

Fish

Caron carbon

John hon gone

If you have a tamed spino with a saddle go to oceans or river and kill the sharks and fish watch out for cnidaria aka jellyfish they will stun your spino and make you hop of your spino.

A high melee damage baryonx is a great fish gatherer, especially in the underworld in the center. However, there is a decent amount of mantas there.

to be honest. this isn’t the kind people eat much. sorry if your fish meat or nothing. but you probably aren’t.